using System;

public class Program

{

    public static void Main()

    {

        var inputStart = new DateTimeOffset(DateTimeOffset.UtcNow.Date + new TimeSpan(20, 0, 0), new TimeSpan(0, 0, 0));

        var inputEnd = new DateTimeOffset(DateTimeOffset.UtcNow.Date + new TimeSpan(20, 30, 0), new TimeSpan(0, 0, 0));

        Console.WriteLine("inputStart: " + inputStart);

        Console.WriteLine("inputEnd:" + inputEnd);

        var startTime = new TimeSpan(5, 0, 0);

        var endTime = new TimeSpan(6, 0, 0);

        var timeZone =  TimeZoneInfo.FindSystemTimeZoneById("Tokyo Standard Time");

        Console.WriteLine("inputStart.Japan: " + inputStart.ToOffset(timeZone.BaseUtcOffset));

        Console.WriteLine("inputEnd.Japan: " + inputEnd.ToOffset(timeZone.BaseUtcOffset));

        var date = inputStart.ToOffset(timeZone.BaseUtcOffset).Date;

        Console.WriteLine("date: " + date);

        var periodStartSystem = date + startTime;

        var periodEndSystem = date + endTime;

        Console.WriteLine("periodStartSystem: " + periodStartSystem);

        Console.WriteLine("periodEndSystem: " + periodEndSystem);

        var periodStart = new DateTimeOffset(date, new TimeSpan(9, 0, 0)) + startTime;

        var periodEnd = new DateTimeOffset(date, new TimeSpan(9, 0, 0)) + endTime;

        Console.WriteLine("periodStart: " + periodStart);

        Console.WriteLine("periodEnd: " + periodEnd);

        Console.WriteLine("DateTime: " + (inputStart.CompareTo(periodEndSystem) < 0 && inputEnd.CompareTo(periodStartSystem) > 0));

        Console.WriteLine("DateTimeOffset(Japan):" + (inputStart.CompareTo(periodEnd) < 0 && inputEnd.CompareTo(periodStart) > 0));

    }

}